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Lake Mayanrd

Chapter 6 Muscles

Muscle Cells Muscle fibers
muscle responsible for smiling zygomaticus
contractility? the ability of skeletal muscle to shorten with force
fascia? located outside the epimysium. It surrounds and separates muscles.
excitability the capacity of skeletal muscle to respond to a stimulus
mastication muscle- deep to the mandible pterygoid
lateral neck muscle rotates and abducts the head
occipitofrontalis (frontalis) raises the eyebrows
levator labii superioris-responsibility? sneering
changes the shape of the tongue. intrinsic tongue muscles
temporalis-responsibility? chewing
fast-twitch fibers contract quickly and fatigue quickly
muscle tone constant tension produced by muscles of the body for long periods of time
anaerobic respiration without oxygen
aerobic respiration with oxygen
slow-twitch fibers contract slowly and more resistant to fatigue
origin (head) most stationary end of the muscle
insertion end of muscle undergoing the greatest movement
portion between the origin and the insertion belly
amount of oxygen needed to convert lactic acid to glucose oxygen debt
muscles that work together to accomplish specific movements synergists
muscles that work in opposition to one another antagonists
one muscle that plays the major role in accomplishing the desired movement prime mover
length of the muscle contraction does not change isometric
amount of tension produced by the muscle isotonic
masseter-responsibilty? chewing
prime mover of the lateral neck muscle? sternocliedomastoid
torticollis meaning a twisted neck
moves the tongue extrinsic tongue muscles
pulls corners of the mouth downward platysma
single sheetlike muscle that covers the anterolateral neck platysma
muscle used to frown? depressor anguli oris
points of attachment of each muscle origin and insertion
2 types of muscle contractions isometric and isotonic
results when ATP is used during muscle contraction faster than it can be produced muscle fatigue
kissing muscles orbicularis and buccinator
orbicularis oris puckers the lips
flattens the cheek "trumpeters muscle" buccinator
closes the eyelids and causes crow's feet orbicularis oculi
contraction of an entire muscle muscle twitch
sliding of actin myofiloments past myosin myofilaments during contraction sliding filament mechanism
the muscle fiber will contract maximally at its threshold
known as "abs" rectus abdomonis
elevate ribs during respiration external intercostals
"white line" extends from sternum to the pubis linea alba
deltoid? felxes, extends, and abducts the arm
erector spinae? group of muscles on each side of back, responsible for keeping back straight and body erect
responsible for quiet breathing diaphram
gives the rectus abdomonis a segmented appearence in muscled person tendinous inscriptions
"swimmer's muscle" latissimus dorsi
attaches humerous to scapula rotator cuff muscles
shoulder, attaches humerous to scapula and clavicle, adducts the upper limb deltoid
extends forearm triceps brachii
flexes the forearm biceps brachii
primary flexor of the forearm brachialis
flexes and pronates the forearm brachioradialis
flexes wrist flexor carpi
extends the wrist extensor carpi
buttocks gluteus maximus
bulge of the calves gastronemius and soleus
Created by: lakemaynard



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